In addition to all the other good advice in the thread, I will emphasise the benefit of having smaller snapshot granularity. I have found this to be one of the most valuable and comprelling reasons when I have chosen to create a separate filesystem.
If there's data that changes often and I don't really need to keep, (like say browser cache) putting that in separate filesystems lets me free those snapshots sooner, and as a result keep more copies for longer of other data I care more about (like my homedir). Once the snapshot is taken with them together in one filesystem, it can only be freed together. -- Dan.
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